Signal mixer circuit

Abstract

A multi-data recording system includes apparatus for generating two control signals of different frequency characteristics. A mixer is provided for interleaving the two types of signals. The display and recording of the data signals is accomplished under the control of the resulting composite signal from the mixer.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 
     
       1. A control circuit for controlling a recording instrumentality comprising, first signal generator means,   said first signal generator means being operative to generate first control signals characterized in being sawtooth pulse signals of relatively slow ramp with successive pulses occurring at spaced intervals,   said first signal generator means being also operative to generate blanking signals, said blanking signals occurring coincidently with said sawtooth pulse   first buffer amplifier means,   coupling means for applying said first control signal to the input of said first buffer amplifier means,   second signal generator means,   said second signal generator means being operative to produce second control signals characterized in being sawtooth pulse signals of relatively fast ramp and of a significantly higher frequency than said first control signal,   second buffer amplifier means,   coupling means for applying said second control signals to the input of said second buffer amplifier means,   said last named coupling means including a switching means responsive to said blanking signal to block the application of said second control signals to said second buffer amplifier means during the occurrence of said first control signals,   output circuit means including a summing junction, and   
     
     
       means connecting the output of said first buffer amplifier means and the output of said second buffer amplifier means to said summing junction whereby output signals of said control circuit comprise a composite of interleaved signals of said first and second control signals. 
     
     
       2. A control circuit as set forth in claim 1 wherein said second signal generator means includes means responsive to said blanking signal to inhibit the operation of said second signal generator means during the occurrence of said first control signals whereby each train of said second control signals being at a predetermined starting point. 
     
     
       3. A control circuit as set forth in claim 2 where said second signal generator means includes means for adjusting the frequency of said second control signals whereby to provide an integral number of complete pulses of said second control signals between successive pulses of said first control signal. 
     
     
       4. In a display/recording apparatus for displaying and recording at least two types of data, one type of such data being of a relatively slow response type data, the other type of data being of a relatively fast response type data, the combination comprising signal conditioning means for signals representative of said one type of data,   said signal conditioning means including means for generating a first control signal characterized in being a sawtooth pulse signal of relatively slow ramp with successive pulses occurring at spaced intervals, and a blanking signal, said blanking signal occurring coincidently with each pulse of said first control signal,   a second generating means for generating a second control signal characterized in being sawtooth pulse signals of relatively fast ramp and of a significantly higher frequency than said first control signal, said second generating means including means responsive to said blanking signal to inhibit the operation of said second generating means to block the generation of said second control signals during the occurrence of said pulses of said first control signals,   a multiplexor for multiplexing signals representative of said other type of data   a signal mixer, including first means for intermixing data signals representative of said two types of data, and second means for intermixing said first and second control signals to form a composite control signal, said second means of said signal mixer being responsive to said blanking signal to block said second control signals during the occurrence of said first control signals,   said multiplexor being keyed by said composite signal,   a data display control circuit,   means for applying the mixed data signals and the composite control signals from said mixer to said data display control circuit to provide data display signals and data sweep control signals, and   display-recorder means responsive to said data display signals and said data sweep control signals to provide a display and/or record representative of said two types of data.